Zimmerton was the head scientist of the Irken empire… there were just a few problems with this… first off… he was a smeet. That is to say, a child. He hated life in the labs that no one visited or even really seemed to know about. Shortly after he had been decanted, he had shown intelligence and had quickly made his way to the status of genius and head scientist in the time it takes a human to age five years. He had his own personal assistant bot, a Generalized Intelligence Reconnaissance bot, or GIR, which was really his best friend.
Zimmerton took a look at what his empire had become from the history books he had loved to read. The empire was all for conquering, but no longer held its original intent. No one even knew what the original intent was anymore. Everyone was a clone, and no one knew how the original Irkens had reproduced or even what had caused them to start cloning.
After escaping the scientist's compound with Gir, Zimmerton made some hard choices, including deactivating Gir so he could be retrieved later. He also took a new name that was less noticeable to the scientists who were looking for the young smeet. By the time he had turned ten, Zimmerman had been part of "Impending Doom" 1 and was also in the second attempt. His new name was Zim.
Zim had been shocked by the tallest, who were so stupid that they didn't even know Zim was a smeet still, and that there were actual scientists who monitored everything that the brains didn't. They had reluctantly accepted him into the second invasion, only by basically banishing him, which had been his goal the entire time. He had been quite ecstatic to be given his own GIR unit, which the tallest had foolishly returned to him without realizing it, another part of his brilliant planning of course. Unfortunately, Gir had been ruined by a few things that the Tallest had placed into his head when trying to "Put him together" for Zim. Zimmerton had decided that he'd fix Gir at a later date.
When the duo had arrived on Earth, Zimmerton had taken care to choose the worst disguise on the list for the soul reason that it was expected of him. He set up his home and enrolled in school under the name Zim Zimmerton. He was quite happy with this, especially since he had met someone worthy of his genius on this planet, Dib Membrane. While the boy hated him solely because he was an alien, whom he identified himself as an alien invader, so he wasn't too surprised, Zim himself however cherished the intelligence that was Dib, as well as the spunk and tenacity of the human boy. He also liked the boy's sister, Gaz, and even though the "Demon Child" was exceedingly dangerous to deal with, Zim found that he appreciated her genius as well. The Membrane family were certainly one that Zim wanted to interact with more.
So he devised tests that were staged as his "attempts to take over the planet" just to keep Dib happy, and so as to not arouse suspicion from the tallest. Zim was quite unhappy to find Tak had been sent to his new planet though. Tak was one of the most brilliant warriors/ invaders to have been decanted since the cloning process had even begun. She was everything an invader should be, or rather, everything that a warrior of ancient times would be jealous of. The Tallest were fools, having banished her under the ruse that if she defeated Zim she could be counted among the Invaders. Zim knew it was because of him that she hadn't been able to make it to where she wanted to in her life, and he truly regretted that, but he still couldn't allow her to defeat him nor could he allow her to destroy his new home.
It had been eight years since Zim had been sent to Earth, and he was nearing graduation from high school with Dib and Tak. Much to Dib's surprise, Zim had mellowed out as time went on, but he still didn't trust the little alien invader… yet…
